New shielding gas mixture for laser conduction welding of aluminum with a filler wire

2021 ◽  
Vol 33 (4) ◽  
pp. 042018
Author(s):  
Junjie Ma ◽  
Keith Pierce
Keyword(s):  
Gas Mixture ◽  
Filler Wire ◽  
Shielding Gas

scholarly journals The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1443 ◽  
Author(s):  
Maroš Vyskoč ◽  
Miroslav Sahul ◽  
Mária Dománková ◽  
Peter Jurči ◽  
Martin Sahul ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Process Parameters ◽  
Flow Rate ◽  
Weld Joint ◽  
Gas Flow ◽  
Filler Wire ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Weld Joints

In this article, the effect of process parameters on the microstructure and mechanical properties of AW5083 aluminum alloy weld joints welded by a disk laser were studied. Butt welds were produced using 5087 (AlMg4.5MnZr) filler wire, with a diameter of 1.2 mm, and were protected from the ambient atmosphere by a mixture of argon and 30 vol.% of helium (Aluline He30). The widest weld joint (4.69 mm) and the highest tensile strength (309 MPa) were observed when a 30 L/min shielding gas flow rate was used. Conversely, the narrowest weld joint (4.15 mm) and the lowest tensile strength (160 MPa) were found when no shielding gas was used. The lowest average microhardness (55.4 HV0.1) was recorded when a 30 L/min shielding gas flow rate was used. The highest average microhardness (63.9 HV0.1) was observed when no shielding gas was used. In addition to the intermetallic compounds, β-Al3Mg2 and γ-Al12Mg17, in the inter-dendritic areas of the fusion zone (FZ), Al49Mg32, which has an irregular shape, was recorded. The application of the filler wire, which contains zirconium, resulted in grain refinement in the fusion zone. The protected weld joint was characterized by a ductile fracture in the base material (BM). A brittle fracture of the unshielded weld joint was caused by the presence of Al2O3 particles. The research results show that we achieved the optimal welding parameters, because no cracks and pores were present in the shielded weld metal (WM).

The influence of arc interactions and a central filler wire on shielding gas flow in tandem GMAW

2016 ◽  
Vol 60 (4) ◽  
pp. 713-718 ◽  
Author(s):  
M. Häßler ◽  
S. Rose ◽  
U. Füssel
Keyword(s):  
Gas Flow ◽  
Filler Wire ◽  
Shielding Gas ◽  
Tandem Gmaw

scholarly journals An experimental investigation of the effectiveness of Ar-CO2 shielding gas mixture for the wire arc additive process

2020 ◽  
Vol 108 (5-6) ◽  
pp. 1285-1296 ◽  
Author(s):  
Bishal Silwal ◽  
Andrzej Nycz ◽  
Christopher J. Masuo ◽  
Mark W. Noakes ◽  
David Marsh ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Gas Mixture ◽  
Shielding Gas ◽  
Additive Process ◽  
The Wire

scholarly journals Effect of the Addition of Nitrogen through Shielding Gas on TIG Welds Made Homogenously and Heterogeneously on 300 Series Austenitic Stainless Steels

2021 ◽  
Vol 5 (3) ◽  
pp. 72
Author(s):  
Rohit Kshirsagar ◽  
Steve Jones ◽  
Jonathan Lawrence ◽  
Jamil Kanfoud
Keyword(s):  
Fatigue Life ◽  
Stainless Steels ◽  
Feed Rate ◽  
Welding Process ◽  
Austenitic Stainless Steels ◽  
Interaction Effects ◽  
Bead Geometry ◽  
Filler Wire ◽  
Shielding Gas ◽  
Wire Feed

Tungsten inert gas (TIG) welding of austenitic stainless steels is a critical process used in industries. Several properties of the welds must be controlled depending on the application. These properties, which include the geometrical, mechanical and microstructural features, can be modified through an appropriate composition of shielding gas. Researchers have studied the effects of the addition of nitrogen through the shielding gas; however, due to limited amount of experimental data, many of the interaction effects are not yet reported. In this study, welds were made homogeneously as well as heterogeneously with various concentrations of nitrogen added through the shielding gas. The gas compositions used were 99.99%Ar (pure), 2.5% N2 + Ar, 5% N2 + Ar and 10% N2 + Ar. Additionally, the welding process parameters were varied to understand different interaction effects between the shielding gas chemistry and the process variables such as filler wire feed rate, welding current, etc. Strong interactions were observed in the case of heterogeneous welds between the gas composition and the filler wire feed rate, with the penetration depth increasing by nearly 30% with the addition of 10% nitrogen in the shielding gas. The interactions were found to influence the bead geometry, which, in turn, had an effect on the mechanical properties as well as the fatigue life of the welds. A nearly 15% increase in the tensile strength of the samples was observed when using 10% nitrogen in the shielding gas, which also translated to a similar increase in the fatigue life.

The Comparative Analysis of the Concentration of Microparticles during Mechanized MAG Welding Using Cored Wires

2013 ◽  
Vol 814 ◽  
pp. 76-81
Author(s):  
Dănuţ Mihailescu ◽  
Octavian Frincu ◽  
Marius Corneliu Gheonea
Keyword(s):  
Carbon Dioxide ◽  
Comparative Analysis ◽  
Welding Process ◽  
Mag Welding ◽  
Gas Mixture ◽  
Metal Powders ◽  
Shielding Gas ◽  
Cored Wire ◽  
Metal Frame ◽  
Cored Wires

Use of cored wire - shielding gas (gas mixture) pair, during mechanized MAG welding, causes the microparticles formation which is harmful for the welder’s health. The paper presents the experimental method for determining the concentration of the microparticles generated during MAG welding when rutile cored wires (standard and low fume emission) and metal powder cored wires (standard and low fume emission) are used. Carbon dioxide and the shielding gas mixture are investigated, too. Four types of cored wires were comparatively analysed, when three wire speed values were applied. The research of the microparticles concentration was conducted after each welding bead deposition, at the upper part of the welding enclosure, using MicroDust Pro particulate monitor. After each weld bead was deposited, the metal frame of the welding enclosure was removed, and, the fumes and gases, produced during the welding process, were eliminated through two fans, positioned inside and outside of the equipment. Using rutile cored wire with low fume emission, a decrease of microparticles concentration up to 30% is noticed in comparison with standard rutile cored wire. Using metal powders cored wire with low fume emission, the microparticles concentration is diminished with 12.5% comparing with standard metal powders cored wire.

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